This circuit was found in a 90s Electronic Engineering. The circuit has the tube's critical element. Operational amplifiers support equivalents.
We found this balanced modulator circuit for DSB and possibly SSB transmissions in US 1980s...
We found this circuit in the 1982 SGS Linear Integrated Circuits manual. The circuit is integrated is...
This 3-digit digital gauge was found in the July 1900 issue of Radio Electronics magazine. The...